Nitrogen, Total, 24 Hour, Urine
Method Description Describes how the test is performed and provides a method-specific reference
The nitrogen analyzer utilizes the Dumas combustion method of determining total nitrogen in urine. Urine (0.5 mL) is added to sucrose (0.1 grams) in a tin capsule, which is blanked with oxygen prior to hermetic sealing to exclude atmospheric nitrogen interference. The capsule is then placed in the instrument, combusted, and oxidized at 960 degrees C. Nitrogen in the form of nitric oxide is released from the specimen and is carried by carbon dioxide through a column containing tungsten that reduces the nitric oxide to molecular nitrogen. Nitrogen is detected using a thermal conductivity detector and response is compared to standards of known nitrogen concentration for quantitation. Complete analysis time is 4.0 minutes per specimen.(Ward JN, Kloke KM, Chezick PA, et al: Rapid accurate quantitation of nitrogen in urine and feces using the Elementar Rapid NIII analyzer. Clin Chem 2002;48[S6]:A71)
PDF Report Indicates whether the report includes an additional document with charts, images or other enriched information
Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.